Since taking office, President Obama has sent U.S. troops into action on land or in the skies of seven countries on two continents. Obama's administration has authorized Navy SEALs to kill Osama bin Laden in Pakistan and approved the fatal drone strike on an American cleric in Yemen. Here is a look at targeted killings under the Obama administration. Mansour was killed when a drone strike hit his vehicle as he traveled in Baluchistan, Pakistan. Mansour, known for his mercurial leadership, had been in the U.S. military's crosshairs for years.